import Vue from 'vue'
import Router from 'vue-router'
import Login from './components/Login.vue'
import Home from './components/Home.vue'
import Welcome from './components/Welcome.vue'
import Users from './components/user/Users.vue'
import Rights from './components/power/Rights.vue'
import Roles from './components/power/Roles.vue'
import Cate from './components/goods/Cate.vue'
import Params from './components/goods/Params.vue'
import GoodsList from './components/goods/List.vue'
import Add from './components/goods/Add.vue'
import Order from './components/order/Order.vue'
import Report from './components/report/Report.vue'

Vue.use(Router)

const router = new Router({
  routes: [
    { path: '/', redirect: '/login' },
    { path: '/login', component: Login },
    { 
      path: '/home', 
      component: Home,
      redirect: '/welcome',
      children:[
        { path:'/welcome',component: Welcome },
        { path: '/users',component: Users },
        { path: '/rights',component: Rights },
        { path: '/roles',component: Roles },
        { path: '/categories',component: Cate },
        { path: '/params',component: Params },
        { path: '/goods',component: GoodsList },
        { path: '/goods/add',component: Add },
        { path: '/orders',component: Order},
        { path: '/reports',component: Report},
      ]
    }
  ]
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  //     next()  放行    next('/login')  强制跳转
  if (to.path === '/login') {
    return next() //进入登录页就直接放行 next()  放行 
  }
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) {
    return next('/login') //当用户名和密码输入不对时，就next('/login')强制跳转 到登录页
  }
  next()
})

export default router